Drain trap



May 15, 1934,.

w. B. NANCE DRAIN TRAP Filed Feb 220, 1933 2 Sheets-Sheet 4 I I III] I INVENTOR.

4;; xx ATTOR 5y.

W. NANCE May 15, 1934.

2 Sheds-Sheet Patented May is, 1934 UNITED STATES PATENT oFrica name mar William B. Nance, Berkeley, Calif. Application February 20, 1933, Serial No. 857,631

4 Claims. (cuss-'20) My invention relates to improvements in drain traps for water-sealing waste pipes and the like, although also useful for other purposes, and the same is a modification of; or. improve- 5 ment over, the invention disclosed in my Patent One of the objectsof the present invention is the provision of a centrally disposed depend ing tubular throat element having inner and outer walls disposed in spaced order and united at their lower ends, thereby forming an annular recess therebetween open at its upper end,

' whereby any water leaking through either of said walls into 'said recess may during flushing of the trap, overflow the upper open end thereof and thereby signal that the. trap is out of proper working order and requires attention;

A further object is to provide a doublewalled weir or dam at the intersection of the body element and the outlet extension, whereby any leakage through the walls thereof may be noticed;

A still further object is to provide a novel connection between the lower ends of the throat element, therebygreatly facilitating in the manufacture of the trap, particularly in the event the same is formed of comparatively thin metal by stamping or the like;

A still further object is the provision of a trap operable, without the installation of a vent pipe, for maintaining a proper water seal in the trap against the flow of sewer gas from the waste pipe through the trap to the open plumbing fixture, such as a sink or the like. With the foregoingand still further objects and purposes in view which will appear as the description proceeds, my-invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed,.it being understoodthat changes in the precise embodiment of the invention herein disclosed can bemade within'the scope of what is claimed without departing from the spirit of the invention.

In the accompanying drawings-- Figure 1 is an axial sectional elevation of a drain trap constructed in accordance with the preferred form of the present invention, secured to a fragmental portion of a plumbing receptacle;

Figure 2 is a side elevation thereof; Figures 3, 4, 5, 6 and 7 are views in elevation of disassembled; parts forming portions of the trap;

Figure 8 is a horizontal section on line 8'--8' of Fig. 1;

Figure 9 is a view in elevation, partly in section, of the depending throat element;

' Figure 10 is a vertical axial section of the upper member of the body or bowl element.

Of the following figures, which show modifications of the preferred form:

Figure 11 is an axial sectional elevation of the trap and a fragmental portion of the plumbing receptacle;

Figure 12 is a view on line 12'-12 of Fig. l1;

Figure 13 is a cross section on line 13'-13 of Fig. 11;

Figure 14 is a side elevation of the upper member of the body or bowl;

Figure 15 is a side elevation of the lower member of said body or bowl;

Figure 16 is a vertical axial sectional view of the upper member of the b ody or bowl; and

Figure 17 is a side elevation of the strainersupporting member and throat element.

In the drawings like reference characters designate like parts throughout the several views.

To facilitate describing the relative position of certain parts or portions of the present inven tion, the right-hand side of .the several figures forming the drawings, is to be considered the front side thereof, and the opposite side the rear side thereof.

Referring now to the drawings in detail, par- -ticularly to the drawings of the'preferred form illustrated in Figs. 1 to 10, inclusive:

The numeral 1 designates a fragmental lower portion of a plumbing receptacle, which may constitute a kitchen sink or the like, and which is provided with the usual outlet opening 2-provided with an annular downwardly extending convergingv flange 3, against the lower end of which is fitted a sealing ring or gasket 4, against as tlmrebetween.

Onto the circumferential face of the ferrule 5 is forced and frictionally bound the upper open and flared end of the inner tubular member 9 of a double-walled depending throat element 10,

the complementing outer tubular member 11 thereof being disposed in spaced parallel order to said inner member, thereby forming an annular recess 12 therebetween.

The member 11 is secured to and supported by the member 9 by fixedly binding their lower ends together to form a gas-tight and watertight connection therebetween, which may well be accomplished in themanner illustrated in Fig. 1, wherein is shown the constriction of the lower end of the outer member 11 to bring it into contact with the inner member 9, and to roll the lower extremity of the latter into an annular loop 13, the outer member of said loop bearing against the member 11 and thereby binding the latter against the inner member of said loop. However, if desired, other means may. be employed for uniting the lower ends of the members 9 and 11 together to form a sufliciently tight joint therebetween.

The margin of the upper end of the member 11 is rolled outwards to form an annular loop 14, into which projects, and between the opposed walls of which is tightly pinched and secured, the upper open end of an upper tubular body element 15. The lower end of the element 15 is also open and is provided on its outer surface with threads 16, which are engaged by threads 1'7 formed on a lower cup-shaped member 18, forming a removable bottom for the said element 15.

The element 15 is provided on its forward side with a tubular outlet extension 19, upon the periphery of which is permanently and fixedly secured a sleeve 20, which is provided with peripheral threads 21 adapted to be engaged by the threads of a suitable waste pipe (not shown).

To prevent any possible leakage between the lower end of thebody element 15 and the lower member 18, there is disposed an annular sealing ring or gasket 22 between said element 15 and an annular offset 23 formed on the interior surface of said member 18.

The lower end of the throat element 10 projects a distance below the outlet extension 19, so that the same will normally be maintained below the water level in the body of the-trap, and whereby said water will form a proper seal against the flow of gases from said extension to said lower end. And in order to better maintain a sufliciently-high water level in the trap, the lower end of the throat element is formed obliquely, being shorter, at the rear than at the front side, thereof. ,Thus in operation, as the sink 1 has become emptied of water, and the water in the waste pipe (not shown) causes a downward suction of the water in 'the throat element 10, the air following the said downward flow thereof, finally escapes at the rear side of said element, and passing upwardly and forwardly to the outlet extension 19, releases any further suction of the water in the waste pipe on the water remaining in the body of the trap, whereby the water in the trap immediately settles'to its level and thereby causing the said lower end of the throat element 10 to again become immersed' in the water and sealed thereby. I

In the modified form of my invention, illustrated in Figs. 11 to 17, inclusive,-. the tubular 'members 9' and 11', which form the throat element 10, and the strainer-supporting member 8', are formed enbloc of a single piece of matepreferred, the same may be formed by stamping or spinning it from a strip of sheet metal.

The element 8' seats against the inner surface of the flange 3, and the internally threaded lock-nut 5 engaging the annular threads 6' on the circumference of the member 8 firmly but removably binds the latter against said flange. A sealing gasket 4' is preferably disposed between the free end 'of the flange 3 and the locknut 5 to insure against leakage therebetween.

The upper end of themember 11 has an outwardly extending annular flange 22, and immediately below said flange is provided with external threads 23', which engage threads 24' on the inner surface of a downwardly extending annular flange 25' at the margin of the centrally disposed opening 26 in the upper end of the tubular body element 15', whereby the latter is removably supported by said member 11'. The lower end of the member 15' is provided with peripherial threads 27, which are engaged by threads 28' on the inner surface of the cupshaped lower member 18 for removably sup-- provided trap without elevating the outlet extension 19' thereon, as any such elevation would locate it too close to the bottom of the sink 1' for conveniently attaching the waste pipe (not shown) to the said extension 19.

Upon opposite sides on the interior of the body element 15, and extending from the latter; to a point on the extension 19 a distance forwardly of the weir 30", are recesses or indentations 31' 31', adapted to provide additional passageways for the waste water flowing from said body portion to said extension, thereby overcoming the restrictions imposed on said flow of the water by the weir or dam 30'.

It will be noted that in the modified form of the invention the maximum diameter'of the strainer-supporting member 8' is substantially greater than the diameter of the member 10, and that the diameter of the latter is less than the diameter of the sink opening at the free end of the flange 3. This arrangement permits the throat element 10' to be readily projected down through said opening in the installation of the trap, prior to the application of the body element 15'. Besides greatly simplying the connection between the trap and the sink 1, this arrangement reduces the number of parts required for properly eifecting such connection. modified; form of the trap, that the body 618-, ment 15, may readily be disconnected from the It is further to be noted, in the throat element 10 and the former from the rial, preferably formed by casting, although, if pose as hereinbefore set forth for the obliquely {50 I I t l formed lower end of the throat element 10 of the preferred form of the invention.

Having described my invention, what I claim and desire to secure by Letters Patent, is:

1. The combination with a plumbing receptacle having an outlet opening in its bottom and having a downwardly annular flange at the margin of said opening, said flange converging towards its free end, of a strainer-supporting member having its upper flared end seated within said flange and supported thereby, the walls of said strainer-supporting member converging below said flange and terminating in an inner tubular member disposed within the body of a complemental outer tubular member, the maximum diameter of said outer tubular member being less than the interior diameter of said free end of the flange whereby said inner and said outer tubular members may be projected downwards through said flange and supported by said strainer-supporting member seated inside said flange.

2. In a drain trap of the character described, a cylindrical body element having a tubular outlet extension, said extension having an indenture in its lower side adjacent its intersection with said body element, said indenture forming sion, a weir extending across the interior of said.

extension at the intersection of the latter with said body element, and indentations on the interior walls of said body element and said extension, said indentations forming opposed interior recesses extending from a mid portion of said body element to a point on said extension distant forward of said weir.

4. In a drain trap of the character described, a hollow body element having an opening in its upper end, and a double-walled tubular throat element projecting vertically into said body element through said opening, one side of the lower end of said throat element terminating downwards short of the opposite side, thereof.

WILLIAM B. NANCE. 

